Dental crown gauge



w. L. STANSBURY 0,887

DENTAL CROWN GAUGE Oct. 17, 1933.

2 Sheets-Sheet 1 Filed Sept. 27, 1932 .75 1 j z 49 Ag 79 Inventor Q By@MMM. f1 Home y UNFTED STATES new Patented Oct. 17, 1933 issues?1,930,887 DENTAL CROWN GAUGE William L. Stansbury, Mountain View, Calif.

Application September 27, 1932' Serial No. 635,080

4 Claims.

This invention relates to a gauge especially adapted for the accurateholding and fitting of dental crowns and inlays, whether of gold,porcelain or other material and consists in the provision of apositively-and micrometrically adjustable gauge to secure firmly plastercast or models of the patients dental formation, while fitting theretodental crowns and/or inlays of gold, porcelain or other material; and toprovide for accurate micrometric adjustment of the crown or inlay beingso formed.

The invention together with its numerous objects and advantages will bebest understood from a study of the following description taken inconnection with the accompanying drawings Where- Figure 1 is a frontelevational view of the gauge.

Figure 2 is a top plan view thereof. a

- Figure 3 is an end elevational View.

Figure 4 is a vertical transverse sectional view therethrough.

Figure 5 is a perspective view of a supporting plate.

igure 6 is a perspective view of a slidable plate.

Figure 7 is a'perspective view of a perforated plate forming part of theinvention, and

Figure 8 is aperspective' view of a ferrule or holder forming part ofthe invention.

Referring more in detail to the drawings it will be seen that the deviceconsists, in its preferred form, of an oblong plate 10 of wood, metal orother suitable material having secured to its front side at 11 achanneled block 12 disposed intermediate the ends of the plate 10 andhaving its sides formed with internal grooves 13.

On the rear face thereof adjacent the lower edge of the block, saidblock 10 is provided with a longitudinal mortise tongue 14. At saidlower edge said block 10 adjacent each end thereof is provided with atongue 15.

Adjustably associated with the plate 10 is a pair of sliding plates 16,17. As shown in Figure 6 each of the plates 16, 17 is substantiallyL-shape and includes a main horizontal or body portion 18 providedadjacent one edge with a standing or fiange portion 19 provided with amortise groove 2! receiving the l tise tongue 14, while at the junctionof the par Us 18, 19 there is provided on each of the plates l6, 17 agroove 21 to accommo- 0 date a tongue 15. I

The vertical or flange part 19 of each plate 16, 17 at one end edgethereof is provided with a right anguiarly disposed projection 22 havingthreadediy engaged therewith an adjusting screw 23 which has one endthereof adapted to engage the adjacent end edge of the plate 16 tofacilitate the adjustment of the plate.

The part 18 of each of the plates 16, 17 is adapted to have detachablysecured to the under side thereof a perforated plate 24, through themedium of screws 25.

Adjacent its lower edge, and on the front face thereof plate 10 is alsoprovided with scales 26 to insure accurate adjustments of the plates 16,17in a manner thought apparent.

A ferrule or holder designated generally-by the reference character 27comprises a body or block like portion 27a arranged for sliding movementwithin the channel of the plate 12 and having tongue 27?) adapted toengage the grooves j 13 whereby the member 27 is constrained to shiftlongitudinally of the channel of member 12. Engaged with the plate 14)and member 12 is an adjusting screw 28that is adapted to bite againsttheblock 27a for securing the member 27 at the desired adjustment aswill be clear from a study of Figure 4.

Member 27 also includes a ferrule likeportion 270 having an opening 29therethrough, opening 29 being substantially oval. shapedin cross sec-80. tion. Forthe opening 29 there is provideda sleeve like lining 30 ofmetal or other suitable material having its upper end swaged as at 30'.Then the sleeve 32 may be suitably packed with plaster paris or otherplastic material 31. In this connection it is to be noted that thetapered oval shaped hole in the f rrule portion 27:: is so shaped as topermit of the tooth model 33 in engagement with. said ferrule likeportion on several different occasions in a manner to insure 90, that asubsequent positioning of the model will conform in every respect to aprevious position of the model when so engaged with the holder.

As set forth in the statement of the invention, the purpose of thisgauge is to enable the dentist to accurately build and fit dental crownsand inlays of any material, that is to say, crowns or inlays of gold,porcelain or other similar material from which such crowns or inlays aremade.

In the present instance I have shown the device when making and fittinga sleeve crown. In use, the dentist first procures a model of thepatients the present instance the upper jaw and divides the model asshown in the drawings into two sections, such sections of the model inthe present instance being designated by the reference characters 32,32a. The model will of course, and as shown, not include a replica ofthe patients tooth to be treated or the portion of the gum associatedwith such tooth. The sections 32, 32a are suitably associated with theperforated plates 24 which in turn are secured in a manner hereinbeforeset forth to the parts 18 of the plates 16, 1'7, and the plates slidablyarranged on the plate 10 are then adjusted relative to one another toposition the teeth on the confronting ends of the sections 32, 32a theproper distance apart. The distance separating said teeth will of coursedepend upon the relative position of the teeth of the patient. A model33 of plaster paris or the like is then made of the tooth to be treated,and the proper end of this model is then embedded in the material 31,after which the member 27 is properly adjusted vertically to dispose thelower end of the model 33 in proper position between the teeth of thesections 32, 32a in the manner shown in Figure l. The crown to be placedon the patients tooth is then fashioned on the lower end of the model33, and when completed, the crown designated generally by the referencecharacter '24 will be of the proper size and can then be readily fittedto the tooth of the patient undergoing treatment.

From the foregoing it will be seen that I have thus devised a simple andeconomical device whereby a dental inlay or crown maybe readily formedand cast to the desired size of a particu lar tooth.

Even though I have herein shown and described the preferred embodimentof the invention, it is to be understood that the same is susceptible offurther changes, modifications and improvements coming within the scopeof the appended claims.

Having thus described my invention, what I claim as new is:

1. A device for use in building and fitting dental crowns and inlays,comprising a base plate, a pair of plates on the base plate and arrangedto shift longitudinally thereof relative to one another, means on thelast named plates for securing sections of a dental model thereto, and aholder slidably mounted on the base plate for movement at right anglesto the plane of travel of said pair of plates, and provided with meansfor securing a tooth model in operative position to the above mentionedsections of a dental model.

2. In a device of the character described, a base plate, a pair ofplates arranged adjacent one edge of the base plate, inter-engagingmeans on the base plate and on each plate of said pair for securing thelatter plates at the desired adjustment, a dental model having sectionssecured to the plates ofsaid pair, a holder member movable in a plane atright angles to said pair of plates, inter-engaging means on said holdermember and said base plate for securing the holder member at the desiredadjustment, and 'a tooth model carried by said holder member.

3. A device for building and fitting dental crowns and inlays comprisinga base plate, supporting plates mounted on the base plate longitudinallythereof, a holder device for a tooth model mounted on the base plate forsliding movement transversely thereof, scale means on the base plate toassist in the accurate adjustment of the supporting plates, perforatedplates detachably mounted on the supporting plates and serving as meansfor anchoring the sections of a dental model to said supporting platefor movement therewith, and said model tooth holder including a parthaving an aperture therethrough and a plastic material arranged in theaperture and into which one end of the model tooth is to beembedded.

4. In a device of the character described, a base plate, a pair of modelcarrying plates slidably mounted on the base plate for movement in thesame plane longitudinally of the base plate, sections of a dental modelsecured to said movable plates, a block mounted on said base plate formovement in .a plane at right angles to mid movable plates, and a toothmodel holder carried by said block, together with a tooth model in .saidholder and having an end arranged for disposition between theconfronting ends of the model sections carried by said movable platesand aiso formed for the application thereto of a dental crown.

. WILLIAM L. STANSBURY.

